isaac



(No Model.)

J. C. ISAAC. Corner Stone for Boundary Lines.

Patented Oct. 5,1880.

-lfll- -El PHMMU um Sn E w E N. T M I W ATTORNEYS".

JQPETE UTHOGRAPNER, WASHINGTON. D C

UNi'rEo States a'rnnr OFFICE.

JOHN C. ISAAC, OF CORNWALL ON THE HUDSON, NEW YORK.

CORNER-STONE FOR BOUNDARY-LINES.

SPECIFICATION forming part of Letters Patent No. 232,972, dated October5, 1880;

To all whom it may concern.- I

Be it known that I, JOHN O.'IsAAo,of Oornwall on the Hudson, in thecounty of Orange and State of New York, have invented a new and ImprovedCorner Stone for Boundary- Lines, of which the following is aspecification.

In field-work, in surveying, much trouble and inconvenience areexperienced from the imperfeet and unsatisfactory marking ofcornerstones by incompetent persons, and from the lack of a uniformcharacter or distinctive type of stones, many of them so nearlyresembling the stones of the locality that they are liable to beoverlooked or lost sight of, and serious troubles and misunderstandingshave, itis well known, often arisen because of the obliteration of theinscriptions thereon byatmospheric influences or by evil-designedpersons.

The object of this invention is to provide a device by means of whichtheseinconveuiences may be almost entirely avoided.

Figure 1 is a vertical elevation of the device with parts broken away toexhibit other parts. Fig. 2 is a cross-section of the same on line 9000, Fig. 1. Fig. 3 is a cross-section of the same on line 3 y, Fig. 1.Fig. 4 is a plan of the same.

Similar letters of reference indicate correspondin g parts.

In the drawings, A represents the body of the post or corner-stoneprovided with a socket or bore, a, extending longitudinally andcentrally throughoutits length, and provided with a cap, B, and a shoe,0, that are held in their respective positions by means of the rod D,that passes through said post or cornerstone A and the said cap and shoeBO, respectively.

That portion of the stone A that is designed to extend above the groundG has, preferably, four faces,as shown,each of which is provided with avertical dovetailed mortise, a, for containing the types orletter-blocks E and quads F, that are correspondingly dovetailed, thatthey may more securely hold in place.

The cap B is provided with a central mortise, b, which is beveled ordovetailed on one face, as shown, and extends through said cap, and saidcap B is also recessed on the under face, as shown at 0, whereby saidcap is fitted over and upon the top of the body of the stone A, and theupper ends of the types or blocks E and the quads F, to hold them,respectively,

Application filed May 24, 1880.

(No model.)

in place, while the flange of said capB extends horizontally in everydirection beyond the faces of the types or blocks E, and thereby greatlyprotects them from atmospheric influences.

The shoe 0 also has a central mortise, 61, extending entirely throughit, and in its inner face two or more sockets, f, into which, when theparts are together in position, the corresponding studs 9, that projectfrom the body Aof the stone, tit and prevent the turning of the saidshoe (J.

The rod 1) is formed into a half dovetail tenou at its top, as shown,while on the opposite face, near its lower extremity, it is cut away, soas to form a square shoulder, 7c, and the said rod D is extended wellbelow the shoe (J, so as to give greater stability to the device whenset in position.

H represents the locking-wedge of the device.

In assembling the parts of this device the rod D is passed down throughthe body A and the shoe G,which latter is set in position with itssockets f holding the studs 9 of the body A; then said rod D is turnedso thatits shoulder shall engage on the under face of the shoe 0, asshown in the drawings; then the desired letters and quads are set inplace in the mortises a, and the cap B is then set on top of the saidbodyA in such a position that the dovetail tenon of the top of the rod Dshall be in contact with the beveled face of the mortise b, as shown,while the head of the rod D shall be flush with or a little below theface of the cap B. The locking wedge H is then driven firmly in themortise a, in the rear of the head of the rod D and flush or a littlebelow the face of the cap B, so as to hold all of said parts immovablytogether, and so that no part of the device can be removed withoutfracture of the part removed or of some other part. a

If desired, molten lead orother substance may be poured into the mortisea,about the locking-wedge H and head of rod D, to effectually seal themagainst the effects of the atmosphere.

This post and all its parts are preferably constructed of iron; but I donot confine myself to the kind of material used in the construction, nordo I confine myself to the precise construction ot'parts and thesecuring them together, as herein shown, as modifications may be made inthese points without departing' from my invention.

Havingthus described my invention, I claim as new and desire to secureby Letters Patent- 1. As an improved article of manufacture, acorner-post constructed substantially as herein shown and described,consisting of the body A, provided with bore a and mortises a a,mortised cap and shocB (3, respectively, shouldered and dovetailed rodD, and locking-Wedge H, as set forth.

'2. The combination, with the body A of a corner-post, provided withletters or blocks E, of the cap B, extending laterally beyond saidletters or blocks, substantially as herein shown and described, wherebysaid letters are protected from atmosphericinfluences, as set forth.

J. O. ISAAC. Witnesses: EDW. D. COPE, RUssELL S. HILL.

